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United States Patent | 6,181,247 |
Bremer ,   et al. | January 30, 2001 |
The present invention relates to a device for electronically surveying items in a monitored area. The device is equipped with a transmitting and/or a receiving device. The aim of the surveying device is to provide an economical way for surveying electronically protected items. To this end, the surveying device is made up of individual layers of material, which taken individually are flexible and possessed of a low level of resistance, but when combined are characterized by a high level of rigidity and resistance.
Inventors: | Bremer; Peter (Beerfelden, DE); Clancy; Terence (Bensheim, DE); Schneider; Peter (Neckargemund, DE); Stocks; David (Herts, GB); Douglas; Anthony (Saffron Walden, GB) |
Assignee: | Meto International GmbH (Hirschhorn, DE) |
Appl. No.: | 403757 |
Filed: | October 29, 1999 |
PCT Filed: | June 8, 1998 |
PCT NO: | PCT/EP98/03412 |
371 Date: | October 29, 1999 |
102(e) Date: | October 29, 1999 |
PCT PUB.NO.: | WO99/00778 |
PCT PUB. Date: | January 7, 1999 |
Jun 25, 1997[DE] | 197 26 986 |
Current U.S. Class: | 340/572.1; 340/551; 340/572.7; 340/572.8; 343/702 |
Intern'l Class: | G08B 013/14 |
Field of Search: | 340/572.1,572.7,572.8,551 342/42,51 343/702 |
4623877 | Nov., 1986 | Buckens | 340/572. |
4769631 | Sep., 1988 | Copeland | 340/551. |
4859991 | Aug., 1989 | Watkins et al. | 340/572. |
5057844 | Oct., 1991 | Rothstein | 342/51. |
5121103 | Jun., 1992 | Minasy et al. | 340/551. |
5485143 | Jan., 1996 | Keniston | 340/568. |
5585811 | Dec., 1996 | Jetzer | 343/867. |
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